Anonymously Replace string with Regex

sion shanyy163 at 163.com
Fri Sep 7 15:07:58 UTC 2018


Emmmmm, pretty sorry for misleading you…

Your solution will not work if I just provide you a regex without telling you detail information, all I want is replace first and second word matched by the regex, nothing more.


> 在 2018年9月7日,下午10:57,Peter Jaszkowiak <p.jaszkow at gmail.com> 写道:
> 
> ```
> input.replace(
>   /your (\w+) from (\w+)/, 
>   (w, a, b) => `your ${a.toUpperCase()} from ${b.toLowerCase()}`
> );
> ```
> 
> On Fri, Sep 7, 2018, 08:49 sion <shanyy163 at 163.com <mailto:shanyy163 at 163.com>> wrote:
> This is just a very simple example, of cause you could write it like that.
> 
> 
> Maybe my second example is unsuitable, how about this one:
> 
> input.replace(/your \w+ from \w+/, a => a.toUpperCase(), b => b.toLowerCase());
> 
> INPUT: your friend from USA  OUTPUT: your FRIEND from usa
> 
> Actually, I am not very familiar with regex, I wonder if there is any performance issue if we support this kind of feature.
> 
> 
> 
>> 在 2018年9月7日,下午10:13,Peter Jaszkowiak <p.jaszkow at gmail.com <mailto:p.jaszkow at gmail.com>> 写道:
>> 
>> You do know that all capture groups are passed to the function, right? You can write your second example like this, even though the capture groups are totally useless:
>> 
>> ```
>> input.replace(
>>   /your (\w+) from (\w+)/g, 
>>   (whole, a, b) => 'your book from amazon'
>> );
>> ```
>> 
>> On Fri, Sep 7, 2018, 07:23 sion <shanyy163 at 163.com <mailto:shanyy163 at 163.com>> wrote:
>> 
>> Is it possible to enhance the string.prototype.replace(regex, func) ?
>> 
>> By now, we can do something like this:
>> 
>> input.replace(/(^|_)[a-z]/g, a => a[a.length - 1].toUpperCase());
>> INPUT: ab_cd_ef     OUTPUT: abCdEf
>> 
>> 
>> However, i want something more powerfull, like this:
>> 
>> input.replace(/your (\w+) from (\w+)/g, a => 'book', b => 'amazon’);
>> INPUT: your friend from china OUTPUT: your book from amazon
>> 
>> As you can see, I just want the replace could replace multi fragments at the same time. And I don’t think there is any conflicts with other principles of string.prototype.replace.
>> 
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> 

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